Microsoft Corp co-founder Paul Allen has donated an additional $300 million to a foundation aimed at expanding research into how the brain works and how best to treat brain-related disorders. The Allen Institute for Brain Science, based in Seattle, was established with a 2003 contribution of $100 million from the former Microsoft executive, who then donated another $100 million. The latest contribution of $300 million will support the first four years of a 10-year plan to address critical questions about how the brain works.